Btrfs: Return value checking in module init

[linux-2.6-block.git] / fs / btrfs / extent_map.h

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 5a63b417034a305fd8b452ddc2303ba36739d458..24ddc8c9346146a2a2f64e06848a05bb04511ea7 100644 (file)
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -14,8 +14,19 @@
 #define EXTENT_LOCKED (1 << 3)
 #define EXTENT_NEW (1 << 4)
 #define EXTENT_DELALLOC (1 << 5)
+#define EXTENT_DEFRAG (1 << 6)
+#define EXTENT_DEFRAG_DONE (1 << 7)
+#define EXTENT_BUFFER_FILLED (1 << 8)
+#define EXTENT_CSUM (1 << 9)
 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
 
+/*
+ * page->private values.  Every page that is controlled by the extent
+ * map has page->private set to one.
+ */
+#define EXTENT_PAGE_PRIVATE 1
+#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
+
 
 struct extent_map_ops {
        int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
@@ -31,6 +42,9 @@ struct extent_map_tree {
        struct address_space *mapping;
        rwlock_t lock;
        struct extent_map_ops *ops;
+       spinlock_t lru_lock;
+       struct list_head buffer_lru;
+       int lru_size;
 };
 
 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
@@ -65,12 +79,14 @@ struct extent_state {
 struct extent_buffer {
        u64 start;
        unsigned long len;
+       char *map_token;
+       char *kaddr;
+       unsigned long map_start;
+       unsigned long map_len;
+       struct page *first_page;
+       struct list_head lru;
        atomic_t refs;
        int flags;
-       struct list_head list;
-       struct list_head leak_list;
-       struct page *first_page;
-       unsigned long alloc_addr;
 };
 
 typedef struct extent_map *(get_extent_t)(struct inode *inode,
@@ -81,6 +97,7 @@ typedef struct extent_map *(get_extent_t)(struct inode *inode,
 
 void extent_map_tree_init(struct extent_map_tree *tree,
                          struct address_space *mapping, gfp_t mask);
+void extent_map_tree_empty_lru(struct extent_map_tree *tree);
 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
                                         u64 start, u64 end);
 int add_extent_mapping(struct extent_map_tree *tree,
@@ -93,9 +110,11 @@ struct extent_map *alloc_extent_map(gfp_t mask);
 void free_extent_map(struct extent_map *em);
 int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
                          get_extent_t *get_extent);
-void __init extent_map_init(void);
+int __init extent_map_init(void);
 void __exit extent_map_exit(void);
-int extent_clean_all_trees(struct extent_map_tree *tree);
+
+int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
+                  int bits, int filled);
 int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
                      int bits, gfp_t mask);
 int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
@@ -117,6 +136,14 @@ int extent_invalidatepage(struct extent_map_tree *tree,
 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
                          get_extent_t *get_extent,
                          struct writeback_control *wbc);
+int extent_writepages(struct extent_map_tree *tree,
+                     struct address_space *mapping,
+                     get_extent_t *get_extent,
+                     struct writeback_control *wbc);
+int extent_readpages(struct extent_map_tree *tree,
+                    struct address_space *mapping,
+                    struct list_head *pages, unsigned nr_pages,
+                    get_extent_t get_extent);
 int extent_prepare_write(struct extent_map_tree *tree,
                         struct inode *inode, struct page *page,
                         unsigned from, unsigned to, get_extent_t *get_extent);
@@ -132,24 +159,20 @@ void set_page_extent_mapped(struct page *page);
 
 struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
                                          u64 start, unsigned long len,
+                                         struct page *page0,
                                          gfp_t mask);
 struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
                                         u64 start, unsigned long len,
                                          gfp_t mask);
 void free_extent_buffer(struct extent_buffer *eb);
 int read_extent_buffer_pages(struct extent_map_tree *tree,
-                            struct extent_buffer *eb, int wait);
+                            struct extent_buffer *eb, u64 start, int wait);
 
 static inline void extent_buffer_get(struct extent_buffer *eb)
 {
        atomic_inc(&eb->refs);
 }
 
-static inline u64 extent_buffer_blocknr(struct extent_buffer *eb)
-{
-       return eb->start / 4096;
-}
-
 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
                          unsigned long start,
                          unsigned long len);
@@ -181,5 +204,9 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
                      unsigned long min_len, char **token, char **map,
                      unsigned long *map_start,
                      unsigned long *map_len, int km);
+int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
+                     unsigned long min_len, char **token, char **map,
+                     unsigned long *map_start,
+                     unsigned long *map_len, int km);
 void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 #endif